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PDF MAS9187 Data sheet ( Hoja de datos )
| Número de pieza | MAS9187 | |
| Descripción | 12 X 8-bit D to A Converter | |
| Fabricantes | MAS | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAS9187 (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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DA9187.002
29 January, 2004
MAS9187
12 X 8-bit D to A Converter
• 3-pin Serial Data Interface
• Low Voltage Output Buffer
DESCRIPTION
MAS9187 is 12-channel 8-bit DAC, designed
primarily for trimmer replacement. Device is
controlled by a simple 3-line input. The output
buffers operate in the entire voltage range from
ground to the positive power supply rail.
FEATURES
• Twelve 8-bit DACs on a single monolithic chip
• Voltage level output
• TSSOP 20 package
• Single, low +1.8 V supply
• Power-on reset
BLOCK DIAGRAM
DAC is selected with four first bits in serial input
data (SDI-pin) and the DAC output value is set
according to the last 8 bits in serial input data.
APPLICATIONS
• High resolution monitors
• Automatic gain control
• Trimmer replacement
SDI
CLK
12-bit
Shift
Register
8-bit data
XCS
Address
Decoder
VREFHVREFL VDD GND
8-BIT DAC
8-BIT DAC
8-BIT DAC
8-BIT DAC
8-BIT DAC
8-BIT DAC
8-BIT DAC
8-BIT DAC
8-BIT DAC
8-BIT DAC
8-BIT DAC
8-BIT DAC
O12
O11
O10
O9
O8
O7
O6
O5
O4
O3
O2
O1
1 (7)
1 page  
OPERATING MODES
DA9187.002
29 January, 2004
DAC maximum output voltage is set using VREFH and VREFL pins (= 255/256 * (VREFH-VREFL)+VREFL)
(note: VREFL=GND in case of MAS9187A1). XRESET pin is used for middle code preset: DAC registers are
reset and middle code will appear at the DAC output.
Serial input data is written to SDI while XCS is low. Data is read at CLK rising edge to on-chip shift register.
Rising XCS-pin stops data reading and 12 CLK-cycles are used as the input data (4 address bits and 8 data
bits). The last 12 bits before rising XCS are used as input data.
◆ Timing diagram
SDI A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0
CLK
XCS
DAC Register Load
VOUT
APPLICATION AND TEST CIRCUIT INFORMATION
Controller
+3.0v
Clock
Data In
Latch
100 nF
20
VDD
1
VREFH
MAS9187A2
8 XSHDN
O12
12
CLK
13 SDI
9 XCS
O11
O10
O9
O8
O7
O6
O5
O4
O3
O2
O1
GND
10
VREFL
11
19
18
17
16
15
14
7
6
5
4
3
2
5 (7)
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet MAS9187.PDF ] | |
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